// Start of functions used by nullsearch
function trim(value)
{
  s = new String(value);
  if (value != null) {
    var beginIndex = -1;
    var endIndex   = s.length;

    for (var i = 0; i < s.length; i++)
    {
      if (s.charAt(i) != " ") {
        beginIndex = i;
        break;
      }
    }
    if (beginIndex == -1) return "";

    for (var j = s.length -1; j > beginIndex; j--) {
      if (s.charAt(j) != " ") {
        endIndex = j;
        break;
      }
    }
    if (endIndex != s.length) return s.substring(beginIndex, endIndex);
    else return s.charAt(beginIndex);
  }
  return value;
}

function isNotNull(value)
{
  if (value == null || trim(value).length == 0 || value == "search site")
  {
    alert('Please enter the keyword(s) to search for');
    return false;
  }
  else
    return true;
}  

function checkSearch( value )
{
  if ( document.searchForm && document.searchForm.datasetId && typeof( langDataSetId ) != 'undefined' && langDataSetId )
  {
    document.searchForm.datasetId.value = langDataSetId;
  }

  if ( value == null || trim(value).length == 0 )
  {
    alert('Please enter the keyword(s) to search for');
    return false;
  }
  else 
  {
    if ( document.searchForm ) document.searchForm.submit();
    return true;
  }
}

function checkGlobalSearch( value )
{
  return checkSearch( value );
}